JP7144085B1 - Syringe, discharge device and coating method - Google Patents

Abstract

[PROBLEMS] To provide a syringe capable of suppressing the occurrence of a phenomenon in which a viscous material crawls up from a gap between a plunger and a barrel when the viscous material filled in the barrel of the syringe is discharged from the syringe. SOLUTION: The syringe has a cylindrical space, one end of the cylindrical space is a viscous material extraction hole, and the other end of the cylindrical space is an opening. and a viscous material filling portion on the viscous material extraction hole side of the cylindrical space and a non-filling space on the opening side of the cylindrical space. a plunger slidably inserted therein, wherein at least one of the barrel and the plunger is flexible, the maximum outer diameter d1 of the plunger being greater than the inner diameter D of the barrel; The syringe, wherein the ratio d1/D of the maximum outer diameter d1 of the plunger and the inner diameter D of the barrel is more than 1.0 and less than 1.1. [Selection diagram] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a syringe for filling a viscous material used in processes such as assembling electronic components.

A syringe is used as a container for storing and applying a given material, such as a viscous material, to a given location. Examples of viscous materials include adhesives, pastes for electrical and electronic circuits, solders for mounting electronic components, and sealants for mechanical and electronic components.

As an example of a syringe, Patent Literature 1 describes a syringe of a liquid dispenser provided with a predetermined plunger. The plunger described in Patent Document 1 includes a tapered tip portion whose rear end portion has an outer diameter somewhat smaller than the inner diameter of the syringe, a small diameter barrel portion continuing to the rear of the tapered tip portion, and a small diameter barrel portion continuing to the rear of the small diameter barrel portion. and a cylindrical portion having a maximum outer diameter larger than the inner diameter of the syringe, and a slit extending in the axial direction of the syringe to divide the cylindrical portion into a plurality of blade members.

Patent Document 2 describes a one-liquid curing sealant cartridge composed of three members: a cylindrical cartridge main body, a nozzle, and a plunger. Patent document 2 discloses that each of the three members is a plastic injection molded product, that the outer surface of the plunger that contacts the inner peripheral surface of the cartridge body is formed to bulge like a barrel, and that the inner diameter of the cartridge body is gradually widens from its distal opening toward its distal opening within the range in which the plunger is in sealing contact with the inner peripheral surface of the cartridge body.

Patent Document 3 describes a syringe container including a barrel, a liquid agent filling portion, a plunger, and a barrel cap. The barrel described in Patent Document 3 has a cylindrical space, one end of which is a liquid agent outlet hole, and the other end of which is an opening. The plunger described in Patent Document 3 is arranged in a cylindrical space so as to divide the cylindrical space into a liquid agent filling portion on the side of the liquid agent extraction hole and a non-filling space on the opening portion side. The maximum outer diameter of the plunger is substantially the same as the inner diameter of the cylindrical space. The barrel cap described in Patent Document 3 is attached to the opening of the barrel and has a pressure adjustment mechanism.

JP-A-5-200343 Japanese Utility Model Laid-Open No. 57-177573 JP 2012-5509 A

Dispensing robots have been introduced in recent years for the application of viscous materials such as adhesives, pastes for electrical and electronic circuits, solders for mounting electronic components, and sealants for mechanical and electronic components. Dispensing robots allow for precise dispensing volume control and accurate positioning when applying viscous materials. In addition, high reliability and productivity are required for the application of viscous materials for the mounting of precision electronic parts. Therefore, it is necessary to develop a technique for stably obtaining the discharge amount of the viscous material.

Patent Document 1 describes an invention of a syringe of a liquid dispenser provided with a predetermined plunger. The invention described in Patent Document 1 focuses on the structure of the plunger. In Patent Document 1, by making the outer diameter of the plunger slightly larger than the inner diameter of the barrel, it prevents the plunger from tilting during extrusion by air, prevents insufficient scraping of the viscous material on the barrel wall surface, and dispenses with a stable application amount. It is stated that

However, the invention described in Patent Document 1 is based on the premise of ejection by air, and is a syringe for relatively low-viscosity materials. Therefore, when a high-viscosity viscous material filled in the syringe described in Patent Document 1 is to be discharged by a mechanical method (for example, extrusion using a rod), the extrusion pressure increases and the plunger deforms. As a result, the viscous material may creep up from the gap created between the plunger and the barrel. Moreover, it is difficult to stably eject the high-viscosity material in the plunger with air.

Further, in Patent Document 2, a cartridge main body (barrel) is designed so that the inner diameter at the tip (discharge port side) is larger than the inner diameter at the rear end, and a plunger having an outer diameter larger than the inner diameter at the rear end of the barrel is used. A curable sealant cartridge (syringe) is described. Patent Literature 2 describes that by using a plunger having such a structure, the ejection pressure is kept constant from beginning to end, and the application amount is stabilized for dispensing.

However, in the one-component curing sealant cartridge described in Patent Document 2, the inner diameter of the cartridge body is designed to be larger on the tip end side. Therefore, as the discharge of the viscous material from the cartridge progresses, there is a possibility that the probability of the viscous material creeping up increases.

As described above, when a conventional syringe is used to fill the viscous material, there is a problem that the viscous material creeps up from the gap between the plunger and the barrel when the viscous material is discharged. likely to occur. In particular, when the viscous material filled in the barrel is pushed out by a mechanical method (for example, extrusion using a rod), there is a higher possibility that the problem of the viscous material creeping up will occur.

If a phenomenon in which the viscous material crawls up (sometimes simply referred to as "crawling") occurs, the rod positioned behind the plunger becomes dirty with the viscous material, and the problem arises that the rod needs to be cleaned. In addition, there arises a problem that the discharge amount of the viscous material is lost due to the occurrence of creeping.

Therefore, the present invention suppresses the occurrence of a phenomenon in which the viscous material creeps up from the gap between the plunger and the barrel when the viscous material filled in the barrel of the syringe is discharged from the syringe by a mechanical method. An object of the present invention is to provide a syringe capable of Another object of the present invention is to provide a viscous material ejection device and a coating method that can suppress the occurrence of a phenomenon in which the viscous material creeps up.

In order to solve the above problems, the present invention has the following configurations.

(Configuration 1)
Configuration 1 of the present invention is a syringe for filling a viscous material,
the syringe
a barrel having a cylindrical space, one end of which is a viscous material extraction hole, and the other end of which is an opening;
It is arranged in the cylindrical space so as to divide the cylindrical space into a viscous material filling portion on the viscous material extraction hole side and a non-filling space on the opening side, and is slidably inserted into the barrel. a fitted plunger;
at least one of the barrel and the plunger is flexible;
A syringe in which the maximum outer diameter d1 of the plunger is larger than the inner diameter D of the barrel, and the ratio d1/D of the maximum outer diameter d1 of the plunger to the inner diameter D of the barrel is more than 1.0 and less than 1.1 be.

(Configuration 2)
Configuration 2 of the present invention is the syringe of configuration 1, wherein the maximum outer diameter d1 of the plunger is 0.3 mm to 3.5 mm larger than the inner diameter D of the barrel.

(Composition 3)
Configuration 3 of the present invention is the syringe of configuration 1 or 2, wherein the viscous material filled in the viscous material filling portion has a viscosity of 20 Pa·s to 980 Pa·s.

(Composition 4)
Configuration 4 of the present invention is any one of Configurations 1 to 3, wherein the inorganic filler contained in the viscous material filled in the viscous material filling portion has an average particle size (D50) of 0.005 μm to 30 μm. is a syringe.

(Composition 5)
Configuration 5 of the present invention is the syringe according to any one of configurations 1 to 4, wherein the plunger has a plunger internal space with an inner diameter d2, and a rib for reinforcing the mechanical strength of the plunger in the plunger internal space. is.

(Composition 6)
Configuration 6 of the present invention is the syringe of any one of configurations 1 to 5, wherein the inner diameter D of the barrel is constant.

(Composition 7)
Configuration 7 of the present invention is a viscous material dispensing device including the syringe of any one of configurations 1 to 6, a rod for depressing the plunger, and rod depressing means for depressing the rod.

(Composition 8)
A configuration 8 of the present invention is a method of applying a viscous material, including applying the viscous material to an object to be coated using the discharge device of the configuration 7.

(Composition 9)
In the configuration 9 of the present invention, the rod is brought into contact with the plunger slidably inserted in the barrel, and the rod is pushed down by the rod pushing-down means to slide the plunger. 9. The coating method according to configuration 8, comprising discharging the viscous material from the barrel and applying it to the object to be coated.

(Configuration 10)
In configuration 10 of the present invention, when the viscous material is discharged from the barrel, the force applied to the rod by the rod pushing means is F(N), and the cross-sectional area of the plunger is S(m ² ). In this case, the application method according to configuration 8 or 9, wherein the extrusion pressure P (P=F/S) applied to the viscous material is 0.04 MPa to 2.3 MPa.

According to the present invention, when the viscous material filled in the barrel of the syringe is discharged from the syringe by a mechanical method, it is possible to suppress the phenomenon that the viscous material creeps up from the gap between the plunger and the barrel. A syringe can be provided that can Further, according to the present invention, it is possible to provide a viscous material discharging apparatus and a coating method capable of suppressing the occurrence of a phenomenon in which the viscous material creeps up.

It is a cross-sectional schematic diagram which shows an example of the syringe of this embodiment. It is a cross-sectional schematic diagram which shows an example of the barrel of the syringe of this embodiment. It is a cross-sectional schematic diagram showing an example of the plunger of the syringe of the present embodiment, FIG. 3A shows an example in which the outer diameter of the plunger is constant, and FIG. Here is an example that is not. 1 is a schematic cross-sectional view showing an example of a syringe of the present embodiment containing a viscous material; FIG. It is a cross-sectional schematic diagram which shows an example of a mode that a viscous material is discharged from the syringe of this embodiment. Fig. 10 is a photograph of the syringe of the present embodiment, showing the appearance of the syringe in a state in which the viscous material does not creep up when the viscous material is discharged, and the viscous material does not exist in the non-filling space. . A photograph of the syringe of the present embodiment, showing the inside of the syringe (barrel) in which the viscous material does not creep up when the viscous material is discharged, and the viscous material does not exist in the non-filled space. It is a photograph. FIG. 8 is a photograph showing a rod used for ejecting a viscous material from the syringe of the present embodiment in the examples shown in FIGS. 6 and 7. FIG. FIG. 10 is a photograph showing the appearance of a syringe in which a phenomenon in which the viscous material creeps up from a gap formed between the plunger and the barrel occurs when the viscous material is discharged. FIG. 2 is a photograph showing the inside of a syringe (barrel) in a state in which a viscous material crawls up from a gap formed between a plunger and a barrel when the viscous material is discharged. In the example shown in FIGS. 9 and 10, when the viscous material is ejected from the syringe, the viscous material creeps up from the gap between the plunger and the barrel. is. 1 is a schematic cross-sectional view showing a barrel having ribs, which is an example of the barrel of the present embodiment. FIG. FIG. 3 is a schematic top view showing a barrel having ribs, which is an example of the barrel of the present embodiment.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. It should be noted that the following embodiments are modes for embodying the present invention, and are not intended to limit the scope of the present invention.

This embodiment is a syringe 10 for filling a viscous material 70 . In FIG. 1, the cross-sectional schematic diagram of an example of the syringe 10 of this embodiment is shown. Syringe 10 of this embodiment includes barrel 20 and plunger 30 . The viscous material filling portion 27 of the cylindrical space 26 inside the barrel 20 is filled with the viscous material 70 (see FIG. 4). Also, the viscous material 70 in the cylindrical space 26 is filled so as to be capped by the plunger 30 . Therefore, the plunger 30 is positioned at the boundary between the viscous material-filled portion 27 of the cylindrical space 26 inside the barrel 20 and the space in which the viscous material 70 does not exist (herein referred to as "unfilled space 28"). become. In this specification, the inner diameter of the barrel 20 (the diameter of the cylindrical space 26) is defined as "D".

3A and 3B show schematic cross-sectional views of the plunger 30. FIG. In this specification, the maximum outer diameter of the plunger 30 is defined as "d1". The maximum outer diameter d1 is the maximum outer diameter of the portion of the plunger 30 in contact with the cylindrical space 26 of the barrel 20 . Plunger 30 preferably has a plunger interior space 32 . In this specification, the diameter of the plunger inner space 32 is defined as "d2". The diameter d2 of the plunger internal space 32 can be the smallest diameter among the diameters of the plunger internal space 32 (see FIG. 3(B)).

In the syringe 10 of this embodiment, the maximum outer diameter d1 of the plunger 30 is larger than the inner diameter D of the barrel 20, and the ratio d1/D between the maximum outer diameter d1 of the plunger 30 and the inner diameter D of the barrel 20 is 1. It is more than 0 and less than 1.1, preferably 1.005 or more and 1.09 or less.

According to the syringe 10 of the present embodiment, when the viscous material 70 filled in the barrel 20 of the syringe 10 is discharged from the syringe 10 by a mechanical method, the viscous material is ejected from the gap between the plunger 30 and the barrel 20. It is possible to suppress the occurrence of the phenomenon that 70 creeps up.

The configuration of the syringe 10 of this embodiment will be described in more detail below.

<Barrel 20>
The syringe 10 of this embodiment has a barrel 20 . The barrel 20 has a cylindrical space 26 , one end of which is the viscous material extraction hole 22 , and the other end of which is the opening 24 .

FIG. 2 shows a schematic diagram of an example of the barrel 20. As shown in FIG. Barrel 20 is cylindrical in shape with a cylindrical space 26 therein. In this specification, the diameter of the cylindrical space 26 (inner diameter of the barrel 20) is defined as "D". In this specification, "the diameter D of the cylindrical space 26" may be referred to as "the inner diameter D of the barrel 20". A viscous material extraction hole 22 is arranged at one end of the cylindrical space 26 . The viscous material extraction hole 22 is in the shape of a thin tubular projection so that the nozzle 62 for extracting the viscous material 70 can be connected. That is, the diameter of the portion of the viscous material extraction hole 22 can be made smaller than the diameter D of the cylindrical space 26 . An opening 24 is arranged at one end (the other end) of the cylindrical space 26 opposite to the viscous material extraction hole 22 . Since the plunger 30 is inserted through the opening 24 , the diameter of the opening 24 is the same as the diameter D of the cylindrical space 26 . In order to facilitate insertion of the plunger 30, the diameter of the opening 24 and its vicinity can be made slightly larger than the diameter D of the cylindrical space 26. As shown in FIG.

Barrel 20 is preferably flexible. Since the barrel 20 is flexible, it is preferable to use a resin material, particularly a transparent or translucent resin material, as appropriate. Specifically, as the material of the barrel 20, polypropylene, polyethylene, polybutene, polyacetal, or the like can be used. The material of barrel 20 is preferably polypropylene.

As used herein, the term "flexibility" means that the shape of an object of predetermined shape (for example, barrel 20) can be deformed by applying pressure from the outside. At least one of the barrel 20 and the plunger 30 of the syringe 10 of this embodiment has flexibility.

In the syringe 10 of the present embodiment, the Shore D hardness of the material of the barrel 20 is preferably 15-65 HS, more preferably 25-55 HS, and even more preferably 35-50 HS. As used herein, Shore D hardness is measured according to the durometer hardness measurement method described in "JIS K6253-3:2012" (for example, a durometer hardness measurement method using a type D durometer). can be used. By setting the Shore D hardness of the material of the barrel 20 to a predetermined value, the barrel 20 can have appropriate flexibility. Therefore, the gap between the inner wall of barrel 20 and plunger 30 can be reduced. Therefore, it is possible to suppress the phenomenon that the viscous material 70 crawls up.

The thickness of the barrel 20 (1/2 of the difference between the outer diameter and the inner diameter) is preferably 0.8 mm to 2.0 mm, more preferably 0.9 mm to 1.8 mm. More preferably, it is 0 mm to 1.7 mm. The predetermined thickness of the barrel 20 allows the barrel 20 to have appropriate flexibility. Therefore, it is possible to suppress the phenomenon that the viscous material 70 crawls up.

Syringe 10 can be of various dimensions depending on the volume to be filled with viscous material 70 . As a volume for storing the viscous material 70 of the syringe 10, generally about 10 cm ³ to 1000 cm ³ , preferably about 100 cm ³ to 500 cm ³ can be used. Corresponding to the volume filled with the viscous material 70, the inner diameter of the cylindrical space 26 of the barrel 20 is generally about 35 mm to 45 mm, preferably about 38 mm to 42 mm. Also, the length of the cylindrical space 26 of the barrel 20 is generally about 70 mm to 350 mm, preferably about 80 mm to 340 mm. The syringe 10 of the present embodiment can be applied to any size of commonly used syringe 10 by appropriately selecting the dimensions of the barrel 20, the plunger 30, and the like. In addition, the syringe 10 of the present embodiment has a predetermined size, so that it can be used as an adhesive, paste for electric/electronic circuits, solder for mounting electronic parts, and sealant for mechanical parts and electronic parts. It can be preferably used for application of viscous materials.

In the syringe 10 of this embodiment, it is preferable that the inner diameter D of the cylindrical space 26 of the barrel 20 is constant. Since the inner diameter D of the barrel 20 is constant, the deformation of the barrel 20 inside the plunger 30 can be the same shape when the viscous material 70 is discharged from the syringe 10 . As a result, generation of a gap between the plunger 30 and the barrel 20 can be suppressed. Note that the inner diameter of the cylindrical space 26 of the barrel 20 is equal to the height h1 of the plunger 30 added to at least the portion filled with the viscous material 70 (viscous material filling portion 27) in the cylindrical space 26 of the barrel 20. It is preferred that D is constant.

<Plunger 30>
The syringe 10 of this embodiment has a plunger 30 . The plunger 30 is arranged in the cylindrical space 26 so as to divide the cylindrical space 26 into a viscous material filling portion 27 on the viscous material extraction hole 22 side and a non-filling space 28 on the opening 24 side. is slidably inserted into the In addition, the viscous material 70 in the viscous material filling portion 27 of the barrel 20 is inserted so as to be airtight in order to prevent the viscous material 70 from leaking into the non-filling space 28 .

FIG. 3A shows a schematic cross-sectional view of the plunger 30. As shown in FIG. As shown in FIGS. 1 and 4, the plunger 30 is inserted through the opening 24 of the barrel 20 and positioned within the cylindrical space 26 of the barrel 20 so as to bisect the cylindrical space 26 . A portion of the cylindrical space 26 bisected by the plunger 30 on the side of the viscous material extraction hole 22 is a viscous material filling portion 27 for filling the viscous material 70 . A portion of the cylindrical space 26 that is divided into two by the plunger 30 on the side of the opening 24 is a space (unfilled space 28) in which the viscous material 70 does not exist. The viscous material 70 in the cylindrical space 26 is filled so as to be capped by the plunger 30 . Therefore, the plunger 30 is positioned at the boundary between the viscous material-filled portion 27 of the cylindrical space 26 inside the barrel 20 and the unfilled space 28 . The ratio of the volume of the viscous material filling portion 27 of the barrel 20 to the volume of the non-filling space 28 is 5:95 to 95:5, preferably 8:92 to 92:8, more preferably 10:90 to 90. :10.

Since the cross-sectional shape of the cylindrical space 26 of the barrel 20 is generally circular, the shape of the plunger 30 can be disc-shaped. The shape of the plunger 30 can be appropriately selected according to the cross-sectional shape of the cylindrical space 26 of the barrel 20. That is, the plunger 30 is inserted so as to be airtight in order to prevent the viscous material 70 from creeping up in the viscous material filling portion 27 of the barrel 20 . It can have substantially the same shape as the cross-sectional shape of the cylindrical space 26 . Also, as shown in FIG. 3A, the barrel 20 can have a hollow structure (a cup-like structure) with one end closed.

As shown in FIG. 3A, in this specification, the maximum outer diameter of the plunger 30 is defined as "d1". In the shape shown in FIG. 3(A), when the plunger 30 is inserted into the cylindrical space 26 of the barrel 20, the portion in contact with the cylindrical space 26 has a constant outer diameter. In the plunger 30 shown in FIG. 3(B), the outer diameter of the portion of the plunger 30 in contact with the cylindrical space 26 is the maximum outer diameter d1. As shown in FIG. 3, the plunger 30 is preferably a hollow structure closed at one end. In this case, plunger 30 would have a plunger interior space 32 . In this specification, the diameter of the plunger inner space 32 is defined as "d2". The diameter d2 of the plunger internal space 32 can be the smallest diameter among the diameters of the plunger internal space 32 .

FIG. 3B shows a schematic cross-sectional view of another shape of the plunger 30 of this embodiment. In the shape shown in FIG. 3(A), when the plunger 30 is inserted into the cylindrical space 26 of the barrel 20, the outer diameter of the portion in contact with the cylindrical space 26 is not constant. In the plunger 30 shown in FIG. 3B, the outer diameter of the uppermost portion of the plunger 30 (the upper portion in FIG. 1 when the plunger is inserted as shown in FIG. 1) has a maximum outer diameter d1. The portion of the plunger 30 having the maximum outer diameter d1 does not necessarily have to be the top. The maximum outer diameter d1 can be at the bottom of plunger 30 or can be between the top and bottom. In order to more reliably suppress the occurrence of the creeping phenomenon of the viscous material 70, the plunger 30 having the cross-sectional shape shown in FIG. 3A is preferable to the plunger 30 having the cross-sectional shape shown in FIG. preferable. That is, as shown in FIG. 3A, the outer diameter of the portion of the plunger 30 in contact with the cylindrical space 26 is constant, preferably the maximum outer diameter d1. Further, in the example shown in FIG. 3B, the diameter d2 of the plunger internal space 32 is the smallest diameter among the diameters of the plunger internal space 32 .

The shape of the plunger 30 can be disk-shaped, but is not limited to this. Any shape may be used as long as it is airtight and slidable. Therefore, ideally, the viscous material filling portion 27 and the non-filling space 28 should be airtight so that movement of substances basically does not occur. Also, the plunger 30 is slidable within the cylindrical space 26 . Therefore, when taking out the viscous material 70 from the viscous material filling portion 27, as shown in FIG. The viscous material 70 can be taken out from the viscous material take-out hole 22 by pressing the rod 80 against the 30 . Further, instead of using the rod 80 , the viscous material 70 can be taken out from the viscous material take-out hole 22 by pressing the plunger 30 by applying gas pressure or the like. A rod 80 is preferably used to remove the high viscosity viscous material 70 stored in the syringe 10 .

Plunger 30 is preferably flexible. Since the plunger 30 has flexibility, a hard material, a resin material, and a material having flexibility (for example, an elastic body) can be appropriately selected and used as the material of the plunger 30 . Specifically, materials for plunger 30 may include polyethylene, polypropylene, polybutene, and polyacetal. It is preferable to use polyethylene as the material of the plunger 30 .

In the syringe 10 of the present embodiment, the material of the plunger 30 preferably has a Shore D hardness of 10HS to 60HS, more preferably 20HS to 55HS, and even more preferably 25HS to 50HS. The predetermined Shore D hardness of the material of the plunger 30 allows the plunger 30 to have appropriate flexibility. Therefore, since the gap between the inner wall of the barrel 20 and the plunger 30 can be made small, the occurrence of the phenomenon that the viscous material 70 creeps up can be suppressed.

In the syringe 10 of this embodiment, at least one of the barrel 20 and the plunger 30 has flexibility. Further, in the syringe 10 of the present embodiment, the maximum outer diameter d1 of the plunger 30 is larger than the inner diameter D of the barrel 20, and the ratio d1/D of the maximum outer diameter d1 of the plunger 30 and the inner diameter D of the barrel 20 is 1.0. It is more than 1.1 and preferably 1.005 or more and 1.09 or less. In some cases, the ratio d1/D can be 1.005 or more and 1.05 or less. At least one of the barrel 20 and the plunger 30 has flexibility, and the maximum outer diameter d1 of the plunger 30 and the inner diameter D of the barrel 20 are in a predetermined relationship, so that the plunger 30 and the barrel 20 It is possible to suppress the occurrence of the phenomenon that the viscous material 70 crawls up by suppressing the occurrence of the gap.

In the syringe 10 of the present embodiment, the maximum outer diameter d1 of the plunger 30 is preferably 0.3 mm to 3.5 mm larger than the inner diameter D of the barrel 20, more preferably 0.4 mm to 3.3 mm larger. More preferably 0.5 mm to 3.0 mm larger. The maximum outer diameter d1 of the plunger 30 can be 0.5 mm to 2.0 mm larger than the inner diameter D of the barrel 20. Due to the predetermined relationship between the maximum outer diameter d1 of the plunger 30 and the inner diameter D of the barrel 20, generation of a gap between the plunger 30 and the barrel 20 can be reliably prevented. Moreover, when the inner diameter of the barrel 20 is constant, when the viscous material 70 is discharged from the syringe 10, the deformation of the barrel 20 inside the plunger 30 can be the same shape. As a result, generation of a gap between the plunger 30 and the barrel 20 can be suppressed.

The dimensions of plunger 30 can be adjusted according to the volume of syringe 10 . Further, the thickness t (1/2 of the difference between the outer diameter and the inner diameter) of the plunger 30 is preferably 0.8 mm to 2.8 mm, more preferably 0.9 mm to 2.7, and 1 More preferably, it is between 0.0 mm and 2.6 mm. It should be noted that if the wall thickness t of the plunger 30 is not uniform, the above range can be the average wall thickness t. If the wall thickness t of the plunger 30 is not uniform, it is preferred that the wall thickness t of the plunger 30 be within the above range for all portions of the wall. Also, the height h1 of the plunger 30 shown in FIG. 3 is preferably 20 mm to 35 mm, more preferably 22 mm to 33 mm, even more preferably 24 mm to 30 mm. In addition, the length h2 of the portion of the plunger 30 shown in FIG. 3 that contacts the inner wall of the barrel 20 is preferably 10 mm to 25 mm, more preferably 12 mm to 23 mm, and further preferably 14 mm to 21 mm. preferable. As shown in FIG. 3, the plunger 30 preferably has a convex shape with a height h1 and a length h2 (h1>h2). Such dimensions allow good storage and retrieval of the viscous material 70 .

As shown in FIG. 12 (schematic cross-sectional view) and FIG. 13 (schematic top view), the plunger 30 of the syringe 10 of the present embodiment has a plunger internal space 32 with an inner diameter d2. It preferably has ribs 34 for reinforcing mechanical strength. In the example shown in FIGS. 12 and 13, eight ribs 34 are arranged radially from the central cylindrical projection 36. In FIG. By arranging the ribs 34 for reinforcing the mechanical strength of the plunger 30 in the space inside the plunger 30 (plunger internal space 32), when the viscous material 70 is pushed out, the force at the time of pushing out is absorbed by the ribs 34. distributed. Therefore, deformation of the plunger 30 can be prevented. By preventing the deformation of the plunger 30, it is possible to suppress the occurrence of a gap between the plunger 30 and the barrel 20, and it is possible to more reliably suppress the phenomenon of the viscous material 70 creeping up. The shape of the ribs 34 is not limited to the shapes shown in FIGS.

When the ribs 34 of the plunger 30 are radially arranged from the central cylindrical projection 36, the number of ribs 34 is preferably 4-16, more preferably 6-10. Further, when the plunger 30 has the ribs 34, the thickness of the outer wall of the plunger 30 (1/2 of the difference between the outer diameter and the inner diameter) is preferably 0.8 mm to 2.8 mm, preferably 0.9 mm. It is more preferably ˜2.7 mm, and even more preferably 1.0 mm to 2.6 mm. Also, the thickness of the rib 34 is preferably approximately the same as the thickness of the plunger 30 . The diameter of the cylindrical projection 36 is preferably 2% to 90%, more preferably 5% to 85%, more preferably 10% to 80% of the maximum outer diameter d1 of the plunger 30. % is more preferred. Since the plunger 30 has a structure having ribs 34, the degree of flexibility of the plunger 30 can be adjusted. Therefore, the occurrence of a gap between the plunger 30 and the barrel 20 can be suppressed, and the slidability between the plunger 30 and the barrel 20 can be made appropriate.

<Barrel cap 40>
As shown in FIG. 4, the syringe 10 of this embodiment can have a barrel cap 40 . A barrel cap 40 is attached to the opening 24 of the barrel 20 to enclose the cylindrical space 26 containing the viscous material 70 . Since the barrel cap 40 can prevent outside air from flowing into the syringe 10, deterioration of the viscous material 70 can be prevented.

Barrel cap 40 may be constructed and dimensioned to seal opening 24 of cylindrical space 26 . Also, the material of the barrel cap 40 can include materials such as polypropylene, polyethylene, and polyacetate.

<Viscosity material extraction hole cover 60>
As shown in FIG. 4, the syringe 10 of this embodiment can have a viscous material extraction hole lid 60 (also called a "tip cap"). A viscous material extraction hole lid 60 is attached to the viscous material extraction hole 22 of the barrel 20 to seal the cylindrical space 26 containing the viscous material 70 . The viscous material extraction hole cover 60 can prevent the viscous material 70 from leaking out, and can prevent outside air from flowing into the syringe 10, so that the viscous material 70 can be prevented from deteriorating.

The viscous material extraction hole lid 60 can be constructed and dimensioned to seal the viscous material extraction hole 22 . Materials for the viscous material extraction hole cover 60 include materials such as polypropylene, polyethylene, and polyacetate.

<Nozzle 62>
When taking out the viscous material 70 from the syringe 10 of this embodiment, the viscous material take-out hole cover 60 can be removed and the nozzle 62 can be attached to the viscous material take-out hole 22 . By using the nozzle 62 , the flow rate, pressure and discharge direction of the viscous material 70 can be adjusted when the viscous material 70 is discharged from the viscous material extraction hole 22 . Dimensions such as the shape and inner diameter of the nozzle 62 can be adjusted and determined as appropriate depending on the application.

<Viscosity material 70>
The syringe 10 of this embodiment is filled with a viscous material 70 . Examples of the viscous material 70 include adhesives, pastes for electric/electronic circuits, solders for mounting electronic parts, sealants for mechanical parts and electronic parts, and the like. In particular, application of the viscous material 70 for mounting precision electronic components requires high reliability and productivity. By using the syringe 10 of the present embodiment, it is possible to suppress the problem that the viscous material 70 crawls up inside the syringe 10, so that high reliability and productivity can be obtained in applying the viscous material 70. can.

As used herein, "viscous material 70" means a highly viscous material. Specifically, the viscosity of the viscous material 70 filled in the viscous material filling portion 27 can be 20 Pa·s to 980 Pa·s, preferably 20 Pa·s to 980 Pa·s, and 50 Pa·s. More preferably, it is up to 900 Pa·s. In this specification, the viscosity means the viscosity measured at a liquid temperature of 25° C. and 10 rpm using a Brookfield viscometer (model number: HBDV type). The syringe 10 of the present embodiment suppresses the occurrence of a phenomenon in which the viscous material 70 creeps up from the gap between the plunger 30 and the barrel 20 even when the viscosity of the viscous material 70 is relatively high. be able to.

The viscous material 70 can contain a liquid resin component and an inorganic filler component (filler). An inorganic filler component (filler) means a particulate inorganic material. The viscosity of the viscous material 70 can be adjusted to an appropriate value by adjusting the viscosity and blending amount of the liquid resin component and the blending amount and particle size of the inorganic filler component.

In the syringe 10 of the present embodiment, the inorganic filler contained in the viscous material 70 filled in the viscous material filling portion 27 preferably has an average particle size (D50) of 0.005 μm to 30 μm. The viscosity of the viscous material 70 can be adjusted to a more appropriate value.

The viscous material 70 can contain an epoxy resin as a liquid resin component. Examples of epoxy resins include bisphenol A type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AF type epoxy resin, bisphenol E type epoxy resin, bisphenol S type epoxy resin, glycidylamine type epoxy resin, biphenyl at least one selected from type epoxy resins, novolac type epoxy resins, alicyclic epoxy resins, naphthalene type epoxy resins, ether type epoxy resins, polyether type epoxy resins, and silicone epoxy copolymer resins. Also, the viscous material 70 can further include a curing agent such as an imidazole compound. The viscous material 70 may further contain a curing catalyst.

Viscous material 70 may include a solvent. Examples of solvents include cyclohexanone, dimethylformamide, dimethylacetamide, benzyl alcohol, dimethylpropanamide and isophorone. By adjusting the amount of solvent added, the viscosity of the viscous material 70 can be adjusted. In the viscous material 70 of the present embodiment, other additives such as carbon black, titanium black, ion trapping agents, leveling agents, antioxidants, antifoaming agents, thixotropic agents, viscosity modifiers, flame retardants, and/or colorants and the like may be added. Selection of the type of each additive and method of adjusting the amount added are known to those skilled in the art.

<Discharge device>
One aspect of this embodiment is the dispensing device for the viscous material 70 . The discharge device of this embodiment includes the syringe 10 described above, a rod 80 for pushing down the plunger 30, and a rod pushing means for pushing the rod 80 down.

FIG. 5 shows a schematic cross-sectional view of an example of how the viscous material 70 is ejected from the syringe 10 of the present embodiment by the ejection device of the present embodiment. The syringe 10 of this embodiment is first fixed at a predetermined position by predetermined fixing means (not shown). Next, the plunger 30 can be pushed down by the rod 80 of the discharge device of this embodiment. The rod 80 is pushed down by applying a force F by rod pushing means (not shown). The plunger 30 shown in FIG. 5 has a structure having a plunger internal space 32 but does not have a rib 34 . As mentioned above, plunger 30 may have ribs 34 .

The rod 80 consists of a shank and a tip, and the outer diameter of the shank can be smaller than the outer diameter of the tip. Materials for the tip of the rod 80 include metals (eg, stainless steel and steel) and synthetic resins (eg, PTFE (polytetrafluoroethylene)). In addition, the rod 80 can be moved in the direction of pushing down the plunger 30 by the rod pushing-down means. In addition, the cross-sectional area of the tip of the rod 80 in contact with the plunger inner space 32 of the plunger 30 is 50% or more of the cross-sectional area of the plunger 30 (the cross-sectional area of the tip of the rod 80/the cross-sectional area of the plunger 30). preferably 70% or more, and even more preferably 90% or more. Since the tip portion of the rod 80 contacts the plunger 30 over a wide area, force can be uniformly applied to the plunger 30 when the viscous material 70 is pushed out. Therefore, deformation and/or tilting of the plunger 30 can be suppressed, and occurrence of a phenomenon in which the viscous material 70 creeps up can be prevented. Since the plunger 30 has a wall, the upper limit of the cross-sectional area ratio (the cross-sectional area of the tip of the rod 80/the cross-sectional area of the plunger 30) is preferably 99%, more preferably 96%. Preferably, it is more preferably 94%.

According to the ejection device for the viscous material 70 of the present embodiment, the viscous material 70 with high viscosity is discharged from the syringe 10 by a mechanical method using the rod 80 while suppressing the phenomenon that the viscous material 70 creeps up. can be discharged. In addition, since the occurrence of the phenomenon that the viscous material 70 crawls up can be suppressed, when the viscous material 70 with high viscosity is discharged from the syringe 10, the rod 80 becomes dirty with the viscous material 70, and the cleaning operation of the rod 80 becomes difficult. You can avoid the problem of needing

<Application method>
Next, the coating method of this embodiment will be described. This embodiment is a method of applying the viscous material 70, including applying the viscous material 70 to an object to be applied using the discharge device described above. According to the coating method of the present embodiment, it is possible to suppress the occurrence of the phenomenon that the viscous material 70 crawls up, so that the problem of loss in the discharge amount of the viscous material 70 can be prevented.

Specifically, in the application method of the present embodiment, first, the syringe 10 of the present embodiment is fixed at a predetermined position by predetermined fixing means (not shown). Next, the rod 80 is brought into contact with the plunger 30 slidably inserted in the barrel 20 . Next, the viscous material 70 is discharged from the barrel 20 by pushing down the rod 80 by the rod pushing-down means and sliding the plunger 30 . In this manner, the viscous material 70 can be applied to the object to be applied. Since the plunger 30 has an appropriately shaped plunger inner space 32, the rod 80 can be brought into contact with the plunger inner space 32 with substantially uniform pressure. In addition, by arranging the ribs 34 in the plunger internal space 32, the force at the time of pushing out is dispersed, and deformation of the plunger 30 can be prevented. In the application method of the present embodiment, it is possible to suppress the phenomenon that the viscous material 70 creeps up. The problem of contamination can be prevented. Therefore, it is possible to prevent the problem that the rod 80 needs to be cleaned.

In the coating method of the present embodiment, when the viscous material 70 is discharged from the barrel 20, the force applied to the rod 80 by the rod pressing means is F (N), and the cross-sectional area of the plunger 30 is S (m ² ). In this case, the extrusion pressure P (P=F/S) applied to the viscous material 70 is preferably 0.04 MPa to 2.3 MPa. By keeping the extrusion pressure P applied to the viscous material 70 within a predetermined range, the ejection of the viscous material 70 can be ensured and the phenomenon of the viscous material 70 creeping up can be suppressed.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these.

<Syringe 10>
Syringes 10 used in Examples and Comparative Examples are as follows.

<<Barrel 20>>
The barrels 20 used in Examples, Comparative Examples, and Reference Examples were 6 OZ (ounce) barrels 20 (capacity: about 170 cc) with different inner diameters D of the barrels 20 . Tables 1 and 2 show the inner diameters D of the barrels 20 used in Examples, Comparative Examples, and Reference Examples. The thickness of the wall of the barrel 20 (1/2 of the difference between the outer diameter and the inner diameter) was the same for all, and was set to 1.5 mm. The material of the barrel 20 was polypropylene and the Shore D hardness of the material was 44HS. The inner diameter D of the barrel 20 was measured using vernier calipers.

A method for measuring the Shore D hardness of the material of the barrel 20 is as follows. That is, first, the barrel was cut out as a test piece of 15 mm×15 mm. Next, the test piece was sandwiched between two iron plates having dimensions of 150 mm×200 mm and a weight of 700 g, heated at 80° C. for 30 minutes, and naturally cooled to flatten the test piece. Shore D hardness (durometer hardness) was measured according to JIS K6253-3:2012 using the test piece thus obtained. A durometer of type D was used, and the value 15 seconds after the start of measurement was adopted. Five points were measured, and the median value was adopted as the Shore D hardness. Furthermore, since the thickness of 6.0 mm condition cannot be satisfied with one test piece in this case, the thickness of the test piece was set to 6.0 mm or more by stacking a plurality of test pieces.

<<Plunger 30>>
Plungers 30 having plunger internal spaces 32 with different maximum outer diameters (d1) were used as the plungers 30 used in Examples, Comparative Examples, and Reference Examples. A maximum outer diameter d1 of the plunger 30 was measured using a vernier caliper. Tables 1 and 2 show the maximum outer diameter (d1) of the plungers 30 used in Examples, Comparative Examples, and Reference Examples. The dimensions other than the maximum outer diameter (d1) were basically the same. That is, the dimension h1 (height) shown in FIG. 3 was 28.7 mm, and the length h2 of the portion in contact with the inner wall of the barrel 20 was 19.8 mm. The wall thickness t of the plunger 30 shown in FIG. 3 was not uniform within one plunger 30 and ranged from 0.9 mm to 2.0 mm. In Examples, Comparative Examples, and Reference Examples, plungers 30 having a similar distribution of thickness t were used. Although the wall thickness t was not constant, the maximum outer diameter (d1) of the plunger 30 was constant, as shown in Tables 1 and 2. In addition, the plunger 30 of Example 7 and the comparison 3 should arrange|position the rib 34 in the plunger internal space 32. FIG. Eight ribs 34 were arranged radially from a cylindrical protrusion 36 at the center of the plunger 30, and had a thickness of 0.8 mm and a height of 6.6 mm. The diameter of the cylindrical protrusion 36 was set to 6.5 mm. The material of the plunger 30 was polyethylene and the Shore D hardness of the material was 42HS. The method for measuring Shore D hardness is the same as for the barrel described above.

<Viscosity material 70>
The viscous material 70 used in Examples, Comparative Examples, and Reference Examples contains the following components. The average particle size is the particle size (D50) of 50% integrated value of all particles. The average particle diameter can be determined from the results of particle size distribution measurement performed by a microtrack method (laser diffraction scattering method).
Liquid resin component: bisphenol F type epoxy resin (YDF-8170 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.)
Inorganic material: silica filler (SE-2300 manufactured by Admatechs Co., Ltd., average particle size: 0.6 μm)

The viscosity of the viscous material 70 was adjusted by adjusting the blending amount of the inorganic material. Tables 1 and 2 show the viscosities of the viscous materials 70 used in Examples, Comparative Examples, and Reference Examples. The viscosity was measured using a Brookfield viscometer (model number: HBDV type) at a liquid temperature of 25° C. and 10 rpm.

<Method for evaluating extrusion pressure>
As shown in FIG. 5 , the viscous material 70 was ejected by applying a downward force to the rod 80 while pressing the rod 80 against the plunger 30 . When ejecting the viscous material 70 , the force (N) applied to the rod 80 was measured with an autograph (Shimadzu precision universal testing machine), and the extrusion pressure (MPa) was calculated from the cross-sectional area of the plunger 30 . Table 1 shows the extrusion pressure (MPa) required to eject the viscous material 70 .

<Evaluation method for presence or absence of creep-up>
When the viscous material 70 was discharged, it was visually confirmed that the viscous material 70 leaked out from between the outer wall of the plunger 30 and the inner wall of the barrel 20 .

Tables 1 and 2 show the evaluation results. As shown in Table 1, in Examples 1 to 7, the viscous material 70 did not creep up when the viscous material 70 was discharged. 6 to 8 show photographs of the appearance and inside of the syringe 10 and the rod 80 after the viscous material 70 has been discharged when the viscous material 70 does not creep up. Barrel 20 is made of a translucent material. As shown in FIGS. 7 and 8, there was no viscous material 70 creeping up. Therefore, it can be seen in FIG. 8 that the viscous material 70 does not adhere to the rod 80 .

As shown in Table 2, in Comparative Examples 1 and 2, creeping of the viscous material 70 was observed when the viscous material 70 was discharged. 9 to 11 show photographs of the appearance and inside of the syringe 10 after ejection of the viscous material 70 and the rod 80 when the viscous material 70 creeps up. Syringe 10 is made of a translucent material. As shown in FIGS. 9 and 10, the viscous material 70 crawled up, so it can be seen in FIG.

As shown in Table 2, in Reference Example 1, since the viscosity of the viscous material 70 was as high as 1100 Pa·s, the viscous material 70 was observed to creep up when the viscous material 70 was discharged.

From the above, by using the syringe 10 of the present embodiment, when the viscous material 70 filled in the barrel 20 is ejected from the syringe 10 by a mechanical method, the gap between the plunger 30 and the barrel 20 , the occurrence of the phenomenon that the viscous material 70 creeps up can be suppressed.

REFERENCE SIGNS LIST 10 syringe 20 barrel 22 viscous material extraction hole 24 opening 26 cylindrical space 27 viscous material filling part 28 non-filling space 30 plunger 32 plunger internal space 34 rib 36 cylindrical protrusion 40 barrel cap 60 viscous material extraction hole lid 62 nozzle 70 viscous material 80 rods

Claims (10)

A syringe for filling a viscous material,
the syringe
a barrel having a cylindrical space, one end of which is a viscous material extraction hole, and the other end of which is an opening;
It is arranged in the cylindrical space so as to divide the cylindrical space into a viscous material filling portion on the viscous material extraction hole side and a non-filling space on the opening side, and is slidably inserted into the barrel. a fitted plunger;
at least one of the barrel and the plunger is flexible;
The maximum outer diameter d1 of the plunger is larger than the inner diameter D of the barrel, and the ratio d1/D between the maximum outer diameter d1 of the plunger and the inner diameter D of the barrel is more than 1.0 and less than 1.1 ,
The plunger is made of only a material with a Shore D hardness of 20HS to 60HS, and the Shore D hardness is a hardness measured by a durometer hardness measurement method using a type D durometer,
A syringe , wherein the viscosity of the viscous material is from 20 Pa·s to 980 Pa·s . A syringe according to claim 1, wherein the maximum outer diameter d1 of the plunger is between 0.3 mm and 3.5 mm greater than the inner diameter D of the barrel. 3. The syringe according to claim 1, wherein the viscous material filled in the viscous material filling portion has a viscosity of 50 Pa.s to 900 Pa.s. The syringe according to any one of claims 1 to 3, wherein the inorganic filler contained in the viscous material filled in the viscous material filling portion has an average particle diameter (D50) of 0.005 µm to 30 µm. The syringe according to any one of claims 1 to 4, wherein the plunger has a plunger inner space with an inner diameter d2, and has a rib for reinforcing the mechanical strength of the plunger in the plunger inner space. A syringe according to any one of claims 1 to 5, wherein the inner diameter D of the barrel is constant. A syringe according to any one of claims 1 to 6;
a rod for depressing the plunger;
rod depressing means for depressing said rod. A method of applying a viscous material, comprising applying the viscous material to an object to be applied using the discharge device according to claim 7 . The viscous material is discharged from the barrel by bringing the rod into contact with the plunger slidably inserted in the barrel, pushing down the rod by the rod pushing-down means, and sliding the plunger. 9. The coating method according to claim 8, comprising applying the composition to the object to be coated. When the viscous material is discharged from the barrel, the force applied to the rod by the rod pushing means is F(N), and the cross-sectional area of the plunger is S(m ² ). The coating method according to claim 8 or 9, wherein the applied extrusion pressure P (P=F/S) is 0.04 MPa to 2.3 MPa.

Images